<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../vue.js"></script>
</head>

<body>
  <div id="app">
    <!-- 如果把data放在textarea的双标签内部 name只能进行单向绑定数据 -->
    <textarea name = "massage">{{city}}</textarea>
    <!-- 想要给textarea进行数据双向绑定,则需要使用v-model -->
    <textarea name="massage" v-model = "city"></textarea>
  </div>
  <script>
    Vue.config.productionTip = false;

    const vm = new Vue({
      el: "#app",
      data() {
        return {
          city: "云南丽江"
        }
      }
    })
  </script>
</body>

</html>